Term | Definition |
Atomic Mass | Average mass of one atom of air element. |
Periodic Table | A chart where all elements are organized into periods and groups according to their properties. |
Chemical Symbol | One -or two-letter code that stands for an element. |
Period Chemistry | A row of elements in the periodic table table arranged by atomic number. |
Group | Column of elements in the periodic table, in which elements have certain properties in common. |
Matter | The material that all objects and substances are made of ; anything that has mass and takes up space. |
Element | Substances that are the building blocks of all matter ; An element is made up of one kind of atom. |
Compound | Matter made up of two or more elements. |
Atom | Smallest particle into which an element can be divided and still have the properties of that elements. |
Electron | Negatively charged particel found outside the nucleus an atom. |
Nucleus-Biology | Structure near the center of a cell that contains the cell's DNA. |
Protons | Positively charged particle located in the nucleus or an atom. |
Neutrons | In an atom, particle with a neutral charged: located in the nucleus. |
Energy Level | The amount of energy carried by an electron an atom. |
Isotope | Atoms of the same elements with different numbers of neutronsin the nucleus. |
Mass Number | The sum of protons and neutrons in nucleus of an atom. |
Atomic Number | The number of protons in the nucleus of an atom. |
Metal | Elements usually solid with a shiny surface. |
Malleable | A term used to describe material that can be pounded into shapes. |
Ductile | A term used to describe ameterial that can be pulled out into a long wire. |
Conductivley | The ability of an object to trans heat pr e;ectrocoty tp another object. |
Reactivity | The ease and speed with thich an element combines, or reacts, with other elements and compounds. |
Corrision | The gradual wearing away of a metal element due to a chemical reaction. |
Allcali Metal | An element in group 1 of the periodic table. |
Alkaline Earth Metal | A element in group 2 of th periodic table. |
Transition Metal | One of the element in group 3 through 12 of the periodic table. |
Alloy | A mixture of two or more elements, one of which is a metal. |
Nonmeatal | An element that lacks most of the lproperties of a metal. |
Diatomic Molecule | A molecule consisting of two atoms. |
Hialogen | An element found in grouop 17 of the periodic. |
Noble Gas | An element in group 18 of the periodic table. |
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